Definition of 百日天下 (ひゃくにちてんか)
ひゃくにちてんか
                        百日天下
ひゃくにちてんか
hyakunichitenka
noun
•
        
very short-lived regime, very brief reign, (Napoleon's post-Elba) Hundred Days(yojijukugo)
Related Kanji
| 百 | hundred | 
| 日 | day, sun, Japan, counter for days | 
| 天 | heavens, sky, imperial | 
| 下 | below, down, descend, give, low, inferior |